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63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#pragma once
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#include <Poco/Net/Socket.h>
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#include <Poco/Net/NetException.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/BufferWithOwnMemory.h>
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namespace DB
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{
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/** Работает с готовым Poco::Net::Socket. Операции блокирующие.
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*/
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class ReadBufferFromPocoSocket : public BufferWithOwnMemory<ReadBuffer>
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{
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protected:
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Poco::Net::Socket & socket;
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bool nextImpl()
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{
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ssize_t bytes_read = 0;
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/// Добавляем в эксепшены более подробную информацию.
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try
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{
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bytes_read = socket.impl()->receiveBytes(internal_buffer.begin(), internal_buffer.size());
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}
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catch (Poco::Net::NetException & e)
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{
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throw Exception(e.displayText(), " while reading from socket (" + socket.address().toString() + ")", ErrorCodes::NETWORK_ERROR);
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}
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catch (Poco::TimeoutException & e)
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{
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throw Exception("Timeout exceeded while reading from socket (" + socket.address().toString() + ")", ErrorCodes::SOCKET_TIMEOUT);
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}
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if (bytes_read < 0)
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throw Exception("Cannot read from socket", ErrorCodes::CANNOT_READ_FROM_SOCKET);
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if (bytes_read)
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working_buffer.resize(bytes_read);
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else
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return false;
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return true;
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}
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public:
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ReadBufferFromPocoSocket(Poco::Net::Socket & socket_, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE)
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: BufferWithOwnMemory<ReadBuffer>(buf_size), socket(socket_) {}
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bool poll(size_t timeout_microseconds)
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{
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return offset() != buffer().size() || socket.poll(timeout_microseconds, Poco::Net::Socket::SELECT_READ | Poco::Net::Socket::SELECT_ERROR);
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}
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};
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}
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